H1 Membranes slides

1 PG 51

Single membrane Double-membrane (2 membranes) ribosomes rough and smooth ER Golgi body mitochondria & chloroplasts lysosomes centrioles nucleus nucleolus   

1(b) Interpret and recognize drawings, photomicrographs and electronmicrographs of the following membrane systems and organelles : o rough and smooth endoplasmic reticulum, o Golgi body, o mitochondria, o ribosomes, o lysosomes, o chloroplasts, o cell surface membrane, o nuclear envelope, o centrioles, o nucleus and o nucleolus.

b) Interpret and recognize drawings, photomicrographs and electronmicrographs of the following membrane systems and organelles : RER and SER, Golgi body, mitochondria, ribosomes, lysosomes, chloroplasts, cell surface membrane, nuclear envelope, centrioles, nucleus and nucleolus. c) Outline the functions of the membrane systems and organelles listed in LO1(b). h) Explain the fluid mosaic model and the roles of the constituent biomolecules (including phospholipids, proteins, glycolipids, glycoproteins and cholesterol) in the cell membranes. i) Outline the functions of membranes at the surface of cell and membranes within the cell. j) Explain how and why different substances move across membranes through simple diffusion, osmosis, facilitated diffusion, active transport, endocytosis and exocytosis. PG 51 1 1 1 1 1

• Found on cell surface or around organelles. PG 51

• Composed of mainly lipids and proteins. Recall “Lipids” lecture => “phospholipid” PG 51

• Composed of mainly lipids and proteins. • Lipids include: –phospholipid –glycolipid –cholesterol PG 51

• Composed of mainly lipids and proteins. • Proteins (peripheral & integral) include: –i.e. Glycoprotein PG 51

• All biological membranes have similar structures. PG 51

• All biological membranes have similar structures. PG 51 Phospholipid bilayer